Ceiling fan



FIG. 1 is a bottom perspective view of a ceiling fan showing our new design;

FIG. 2 is a top perspective view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

Broken lines illustrate environmental subject matter that forms no part of the claimed design. 

CLAIM The ornamental design for a ceiling fan, as shown and described. 